A woman of little words, she noted. It didn't bother her-- in fact, she was glad to not have a roommate that was loud and noisy, and it was a small mercy.

"Yes, it is. And like a key, it will only open that door." Unless there was something else Naoto didn't know, but she wasn't about to impose that thought on someone who was obviously unused to such technology. "So you should not lose it, otherwise you would have problems coming in."